Island



(No Model.)

H. T. SMITH.

MANUFAGTURE 0P HOLLOW PLATED METAL INGOTS AND SEAMLESS WIRE.

PatentedJuly 15, 1890.

FIE-1.4.

' FIGIEI INVENTOR.

WITNESSES.

H'enrs T 'Sm'kHn UNITED STATES PATENT CEEI E.

HENRY T. SMITH, OF PROVIDENCE, Rl lCDE ISLAND, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO ROSIVELL C. SMITH, TRUSTEE, OF SAME PLACE.

MANUFACTURE OF HOLLOW PLATED-METAL INGOTS AND SEAMLESS WIRE.

SPECIFICATION forming part of Letters Patent No. 432,496, dated July 15, 1890.

Application filed April 18, 1890. Serial No. 348,540. (No specimens.)

To all whom, it may concern: formation of it into a tube is the object of the Be it known that I, HENRY T. SMITH, of the present invention, and this is accomplished city and county of Providence, and State of as hereinafter described and claimed.

Rhode Island,have invented certain new and The better to illustrate my improved prouseful Improvements in the Manufacture of cess there is shown in Figure 1 of the draw- Hollow Plated-Metal Ingots and Seamless ings a rudimentary compound ingot in perlVire Therefrom; and I do hereby declare the speetive, the shape of said ingot being that following specification, taken in connection of a circular plate. Fig. 2. shows this rudiwith the accompanying drawings forming a mentary ingot drawn up into cup form. Fig.

10 part of the same, to be a description thereof. 3 represents the same reduced in diameter This invention relates to a process of proand elongated into tubular form. Fig. 4shows ducing hollow plated-metal ingots and seama small piece of seamless plated wire proless wiretherefrom for the use of jewelers, &c. duced from such tube. Fig. 5 represents in In Letters Patent. of the United States isperspective a pair of dies for use in trip-ham- 15 sued to me March a, 1890, and numbered mering the cup-formed ingot into the tubular o5 422,6et7, there is described a process of formform shown in Fig. 3. ingatubular-shaped ingot from acircularcom- A represents the rudimentary ingot, which pound plate of metal, which process consists is preferably in the form of a circular plate, in drawing up such plate, by means of suitone portion a of which is composed of copper 2o able dies andplungers, into the form ofatube or other suitable low-grade metal, and the having a closed end. hen the circular comother portion a of gold or other superior pound plate orrudimentary ingot is comparametal soldered or otherwise secured to one tively thin, no trouble is experienced in proof the faces or sides of the plate a. By means ducing the tubular ingot without imperfecof one or more properly-shaped plunge-rs and 25 tions, provided a suitable number of dies and dies the compound plateAis drawn or stamped plungers be used in the drawing-up process. up into the form of a cup B, the gold or supe- \Vhen, however, seamless plated wire is to be rior metal portion of the compound plate bemannfactured on a large scale and of great ing upon the outside. Experience has shown length, the compound plate or rudimentary that such a rudimentary ingot five-sixteenths 3o ingot must be quite thick, and a large numof an inch thick can be drawn or stamped 8o ber of dies and plungers would be necessary up into the cup form B by one or more suitto draw up such plate into tubular form. Exable dies and plungers' without producing perience has shown me that even when avery any cracks in the superior outer portion of large number of dies and plungers are emthe ingot.

5 ployed and great care is exercised the gold To reduce the cup-shaped ingot B to the or other superior metal forming the outer portubular form C, I employ a trip-hammer and tion of the ingot will crack in some places several .pairs of duplicate dies, as D, one die during the drawing up of the compound plate of each pair being preferably located 011 a into tubular form, owing to the thickness of stationary bed and the other being secured 40 the plate or rudimentary ingot and the tendto the hammer-arm or head. Preferably the cncy of the superior outer portion thereof to walls of these dies taper, as shown at d, Fig. crawl or separate under great strain and 5, and terminate at one end in a groove whose the friction of such superior outer portion of walls (1' are parallel. By means of a suitable the ingot against the walls of the dies. These number of such duplicate dies the cup-shaped 5 cracks in the superior metal of the ingot beingot B may be trip-hammered, and thereby 93 come enlarged when the ingot is reduced or reducedin diameter and elongated to the form drawn into wire, thereby rendering the wire of the tube C, and this elongation and reducimperfect. tion of size may be continued until the di To obviate the crawling or cracking of the ameter of the tube has been greatly reduced,

50 superior outerportion of the ingot during the if desired, without any danger of the Superior IOO metal forming the outer portion of the ingot being cracked, for the trip-hammering absolutely preserves the integrity of the superior outer portion of the ingot. Not only does this trip-hammering preserve the integrity of the superior outer metal of the ingot, but the reduction of the cup-formed ingot to a tube or even to a rod can be accomplished in much less time and with very many less dies or tools, besides requiring many less annealings than would be necessary were not such triphammering employed in the process of reduction.

If, for example, the compound plate or rudimentary ingot A be six inches in diameter and five-sixteenths of an inch thick, such plate may be drawn or stamped up by a single die and plunger into the cup form B, which will be about four inches in diameter and two and one-fourth inches deep,without cracking the superior outer portion of the ingot. This cup-formed ingot isthen subjected to the action of several pairs of duplicate dies in a trip-hammering machine, and if three pairs of such dies be used the ingot maybe reduced to the tube form shown in Fig. 3, which will be about one and one-fourth inch in diameter and seven inches long. This tube-formed inget may then be operated upon by well-known reducing machinery to fit it for the drawbench. If desired, however, the trip-ham mering of the ingot may be continued by proper dies until it has been reduced sufficiently in diameter to be operated upon in a draw-bench.

By means of a draw-bench or rolling-machine the ingot may be drawn into wire of any desired gage or diameter, and if it be reduced to size No. 27, Brown & Sharpe gage, a coil of seamless plated wire about four thousand four hundred (4300) feet long will be produced, the outer or superior portion of which will be free from cracks or flaws.

From the foregoingitwill be readily understood that the rudimentaryingot A can be formed into the cup 1 by a single die and plunger, and such cup can be reduced by trip-hammering with a few dies to a diameter suitable to be operated upon in a draw-bench, thus saving a great deal of time, many dies and tools, and many annealings, as well as obviating all cracking of the superior outer portion of the ingot.

What I claim, and desire to secure by Letters Patent, is-

1. The improvement in the proeessof formin g hollow plated-metal ingots, which consists in drawing or stamping up a compound plate into cup form with the superior metal on the outside, then trip-hammering such cup into a tube form by means of dies, substantially as set forth.

2. The improvement in the process of forming seamless plated wire, which consists in drawing or stamping up a compound plate of metal into cup form with the superior metal on the outside, then trip-hammering such cup into a tube or rod, and finally drawing or reducing such tube or rod into wire, substantially as set forth.

The improvement in the process of forming seamless plated wire from a cup-formed ingot having the superior metal on the out side, which consists in trip-hammering such cup-formed ingot between dies to reduce it into a tubular 0r rod form, and finally drawing or reducing such tube or rod into wire, substantially as set forth.

4. The improvementin the process of forming seamless plated wire, which consists in soldering or attaching a plate of superior metal to a plate of low-grade metal, drawing or stamping up such compound plate into a cup-formed ingot, trip-hammering such cupt'ormed ingot into a tube or rod by means of suitable dies, and finally drawing or reducing such tube or rod into Wire, substantially as set forth.

HENRY T. SHITII.

\Vitnesses:

EosoN SALISBURY Jones, M. W. Jones. 

